Question

在Magento中，我使用Zend DDL创建查询，将group_concat（）表值放入一个名为“sites”的字段中。

查询正常工作，直到添加了where子句。

SELECT
  `main_table`.*,
  GROUP_CONCAT(website.website_id) AS `websites`
FROM
  `megamenu_entity` AS `main_table`
   LEFT JOIN `megamenu_website` AS `website`
   ON main_table.entity_id = website.megamenu_id
WHERE
  (websites = '1')
GROUP BY `main_table`.`entity_id`

给出错误：

SQLSTATE [42S22]：未找到列：1054'where子句'中的未知列'网站'

这是为什么？任何人都可以帮我解决这个问题吗？理想情况下，在Zend DDL。这就是我现在正在做的事情。

$collection->getSelect()->joinLeft(
  array('website' => $collection->getTable('megamenu/megamenu_website')),
  "main_table.entity_id = website.megamenu_id",
  array('websites' => new Zend_Db_Expr('GROUP_CONCAT(website.website_id)'))
)->group('main_table.entity_id');

由于

Answer 1

您的WHERE子句无法识别列别名。列别名可以在GROUP BY，ORDER BY和HAVING子句中使用。

更新了您的查询以使用原始列名称，例如：

SELECT
  `main_table`.*,
  GROUP_CONCAT(website.website_id) AS `websites`
FROM
  `megamenu_entity` AS `main_table`
   LEFT JOIN `megamenu_website` AS `website`
   ON main_table.entity_id = website.megamenu_id
WHERE
  (website.website_id = '1')
GROUP BY `main_table`.`entity_id`

Answer 2

请尝试以下代码

SELECT * FROM 
(                     
SELECT
`main_table`.*,
GROUP_CONCAT(website.website_id) AS `websites`
FROM
`megamenu_entity` AS `main_table`
LEFT JOIN `megamenu_website` AS `website`
ON main_table.entity_id = website.megamenu_id ) E
WHERE
(E.websites = '1')
GROUP BY `main_table`.`entity_id`

Answer 3

尝试查询..

SELECT
  `main_table`.*,
  GROUP_CONCAT(website.website_id) AS `websites`
FROM
  `megamenu_entity` AS `main_table`
   LEFT JOIN `megamenu_website` AS `website`
   ON main_table.entity_id = website.megamenu_id
WHERE
  ((GROUP_CONCAT(website.website_id)) = '1')
GROUP BY `main_table`.`entity_id`

您的查询无效，因为在群组之前执行。

Zend MySQL：Where子句中的未知列 - 使用GROUP_CONCAT（）时

3 个答案: